Light metal alloy



Patented Nov, 10, 1931 i I UNITED STATES PATENT OFFICE scam wmss, or vmmu, ausrau mcn'r METAL annoy" No Drawing. Application fled May 25, 1929, Serial 170. 888,088, and in France November 23, 1928.

The light metal alloys'hitherto used for the pistons of internal combustion engines are for the most part aluminum-copperalloys with addition of silicon, iron, manganese and the like. But, the addition of silicon or manganese has the drawback that the alloys become comparatively hard, the cylinder-walls thereby and on account of the small sliding power being worn out'within a comparatively short time. The hardness of the alloy im airs also its capability of being worked. Furthermore it is difiicult to avoid porosity of the casting.

According to the present invention the al- 10y consists of aluminium, of 12 to 18 parts by weight of copper, of 0.1 to 5 parts of. magnesium and of.0.1 to 5 parts of nickel, sum total 100 parts by weight.

' Also nearly 0.05 to 8 parts by weight of 20 iron orthe like may be added to the said alloy. I Y I The alloy according to the invention allows to produce without trouble a homogeneous and dense casting; the material is easily workable; the heat conductivity is very .hlgh; the .pistons made of such a material have a high sliding power. Accordin' to Y the proportions employed the specific weight is 2.9 to 3.1, the ball test hardness is 140 to so 150 and the strength is 20 to 22 kg/mm.

' Of| course, this alloy may also be used for other objects than pistons, especially for the connecting-rod of internal combustion en 'gines or for other parts of machines.

85' .What I- claim is:

1. A light metal alloy consisting of: aluminium, 12 to 18 parts by weight of copper 0.1 to 5.00 arts by weight of magnesium, 0.1 to 5 parts y weight of nickel, the total sum 40 being 100 parts by weight.

2. A light'metal alloy. consisting of: aluminium, 12 to 18. parts by weight of copper 0.1 to 5.00 parts by weight of ma esium', 0.1- to 5 parts by weight of nickel an of 0.05 to 8 parts by weight of iron, the total sum being parts by weight S1 ed-at Vienna, Austria, this 11th day of ay, 1929. 0 'JOHANN WEISS. 5 

